My senior dog eats a lot but isn't gaining weight. Could it be cancer?
Updated On September 23rd, 2025
Pet's info: Dog | American Pit Bull Terrier | Male | neutered
I am very concerned my pitt turned 13 t his month and for some or other reason he has this ravenous appitite but he is not gaining weight. He is very happy but sleeps a lot but that is to be expected. I really hope he does not have cancer. My Border Collie suddenly started eating like a horse and never gained weight. he had prostrate cancer. Could that be a possiblity?
2 Answers
Most Helpful Answer
Published on January 20th, 2018
Thank you for using Petco Pet Education Center, formerly Petcoach! Unfortunately, cancer is not uncommon in older dogs and can cause weight loss. Weight loss can also be caused by conditions such as IBD, diabetes, or be a normal part of the aging process. I recommend having Milo seen by a vet for blood work and x-rays to check if he has any masses and make sure his organs are functioning normally. I hope all is well with Milo!
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on October 4th, 2017
So sorry that your dog is having this problem. I am not exactly sure why they are recommending an MRI. You should ask your vet if they can do abdominal and chest x-rays first to see if the problem can be diagnosed with just x-rays. You could also go to a different vet for a second opinion. Cancer is always a concern in an older dog that is losing weight so additional diagnostics should be done to try and determine the cause but x-rays could be done before doing an MRI.
1Pet Parents found this answer helpful
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